diff --git a/Project.toml b/Project.toml
index 88aad7ee..d352888f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -15,6 +15,7 @@ Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 StaticArraysCore = "1e83bf80-4336-4d27-bf5d-d5a4f845583c"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 SymbolicIndexingInterface = "2efcf032-c050-4f8e-a9bb-153293bab1f5"
+SymbolicsBase = "13454fcc-48b2-433e-829a-0418001dc7cb"
 Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 
 [compat]
@@ -27,6 +28,7 @@ RecipesBase = "0.7, 0.8, 1.0"
 Requires = "1.0"
 StaticArraysCore = "1.1"
 SymbolicIndexingInterface = "0.1, 0.2"
+SymbolicsBase = "0.1.0"
 Tables = "1"
 Zygote = "0.6.56"
 julia = "1.6"
diff --git a/src/RecursiveArrayTools.jl b/src/RecursiveArrayTools.jl
index 51fa3b0a..482aa8f8 100644
--- a/src/RecursiveArrayTools.jl
+++ b/src/RecursiveArrayTools.jl
@@ -13,6 +13,10 @@ import Adapt
 
 import Tables, IteratorInterfaceExtensions
 
+import SymbolicsBase: AllObserved, issymbollike
+# Re-export from SymbolicsBase
+export AllObserved
+
 abstract type AbstractVectorOfArray{T, N, A} <: AbstractArray{T, N} end
 abstract type AbstractDiffEqArray{T, N, A} <: AbstractVectorOfArray{T, N, A} end
 
@@ -38,7 +42,7 @@ import Requires
 end
 
 export VectorOfArray, DiffEqArray, AbstractVectorOfArray, AbstractDiffEqArray,
-       AllObserved, vecarr_to_vectors, tuples
+       vecarr_to_vectors, tuples
 
 export recursivecopy, recursivecopy!, recursivefill!, vecvecapply, copyat_or_push!,
        vecvec_to_mat, recursive_one, recursive_mean, recursive_bottom_eltype,
diff --git a/src/vector_of_array.jl b/src/vector_of_array.jl
index ab056e4d..be1159b3 100644
--- a/src/vector_of_array.jl
+++ b/src/vector_of_array.jl
@@ -61,18 +61,9 @@ mutable struct DiffEqArray{T, N, A, B, C, E, F} <: AbstractDiffEqArray{T, N, A}
     p::F
 end
 ### Abstract Interface
-struct AllObserved
-end
 
 Base.@pure __parameterless_type(T) = Base.typename(T).wrapper
 
-@generated function issymbollike(x)
-    x <: Union{Symbol, AllObserved} && return true
-    ss = ["Operation", "Variable", "Sym", "Num", "Term"]
-    s = string(Symbol(__parameterless_type(x)))
-    any(x -> occursin(x, s), ss)
-end
-
 function Base.Array(VA::AbstractVectorOfArray{T, N, A}) where {T, N,
                                                                A <: AbstractVector{
                                                                               <:AbstractVector