I can’t say I particularly like sponges. For reasons irrelevant this minute.
However, the brain, my brain, apart from looking like a sponge, is a sponge. Absorbent. Very. Till it drips. Where the sponge has one over the brain is that you can wring it – unlike your brain.
Alternatively I wish I could hoover my brain’s recesses. Or order everything stored up there alphabetically, to locate when needed.