This looks like an ordinary park bench, right?
Then you will see that, even here, on a presumably treated and processed and painted (or stained) piece of wood, fungi are active.
The bright orange blobs are the aptly named Orange Jelly fungus (Dacryomyces stillatus) and the washed-out yellow blobs are probably Yellow Brain Fungus (Tremella mesenterica) – I say probably because there's another fungus that looks a lot like this one, Tremella aurantia, but it's parasitic on a third fungus, Hairy Curtain crust (Stereum Hirsutum), which does not appear to be present here – but who knows what's lurking inside the wood?
How interesting! And what good eyesight you have!
I keep meaning to ask you – the monkey in your header photo – what is it looking at? Is it a leaf or a caterpillar or what?