#18 (Displacement series)

Toss a rock removed from Lake Desoto in Hot Springs Village, Arkansas into Laurel Lake in Maryland.

#17

"Anonymous Art" found.

#16

Glue small plaque on wall near NW corner of 7th & Independence Ave: text reads: "Spiral Jelly" site - for Robert Smithson."

#15

Glue small plaque on wall near corner of 17th & G Streets: text reads: "Corner Pie" site - for Robert Morris."

#14 (as fault)

Pour (until empty) one can of Hershey's chocolate syrup down inclined path leading to Dumbarton Oaks Trail (eastern end of cul-du-sac at Whitehaven Street, NW).

For Robert Smithson.